"""
    语法：
        import 模块名   全部导入
        from 模块 import 具体功能名    导入某个具体功能
        from time import sleep as sl   as起别名的意思
"""
# import time
# time.sleep(3)
# print('你好')

# from time import sleep
# sleep(3)
# print('你好')

# from time import *  # 导入全部功能的意思
# sleep(3)
# print('你好呀')

# from time import sleep as sl
# sl(3)
# print('你好呀呀')

import time as t
t.sleep(3)
print('你好呀呀')
